ftp.nice.ch/pub/next/tools/screen/backspace/_GrayAquarium.N.bs/GrayAquarium/Fish.m

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#import "Thinker.h"
#import "Fish.h"
#import "FishBrain.h"
#import "DuoImage.h"
#import <appkit/appkit.h>
#import <dpsclient/wraps.h>
#import <stdio.h>
#import <libc.h>
#import <math.h>
#include <sys/stat.h>

#define FISHPICTS		20	// Maximum number without recompile
#define NUMBER_OF_FRAMES	1	// Need more frames eventually

@implementation Fish

- init:sender
{
	NXRect bufferRect;
	NXRect rect;
	struct stat statbuf;
	const char *ptr;
	float r = .000, g = .000, b = .000;
	char fishfile[MAXPATHLEN];
	char fishType[10] = "salt";
	aquarium = sender;

	[aquarium getFrame:&rect];
	sizeOfAquar = rect.size;

	srandom(currentTimeInMs());
	
	fxType = 0;
	ptr = NXGetDefaultValue([NXApp appName], "AquariumFxType");
    if (ptr)  sscanf (ptr, "%d", &fxType);
	
	dissolveFactor = 3;
	ptr = NXGetDefaultValue([NXApp appName], "AquariumDissolveFactor");
  	if (ptr)  sscanf (ptr, "%d", &dissolveFactor);
	
	ptr = NXGetDefaultValue([NXApp appName], "AquariumColor");
    if (ptr)  sscanf (ptr, "%f %f %f", &r, &g, &b );
	fishBufferColor = NXConvertRGBToColor(r,g,b);

	ptr = NXGetDefaultValue([NXApp appName], "AquariumFishType");
    if (ptr)  sscanf (ptr, "%s", fishType );
	
	do {
		sprintf(fishfile,"%s/%s/fish.%d.tiff",[BSThinker()
			moduleDirectory:"Aquarium"],fishType,
			(int)(random() % FISHPICTS + 1));
	} while(stat(fishfile,&statbuf) == -1); 
		
	fish = [DuoImage allocFromZone:[self zone]];
	[fish initFromFile:fishfile];
	[fish getSize:&bufferRect.size];

//	bufferRect.size.width /= (NUMBER_OF_FRAMES);

	WIDTH=bufferRect.size.width;
	HEIGHT=bufferRect.size.height;
	brain = [[FishBrain allocFromZone:[self zone]] init:&sizeOfAquar 
					fishSize:&bufferRect.size owner:fish];

	clear_buffer = [[NXImage alloc] initSize:&bufferRect.size];
	fish_buffer =  [[NXImage alloc] initSize:&bufferRect.size];

	[clear_buffer lockFocus];
		NXSetColor(fishBufferColor);
		NXRectFill(&bufferRect);
	[clear_buffer unlockFocus];
 
	return self;
}

- erase 
{
	[clear_buffer composite:NX_COPY toPoint:&old.origin];	
	return self;
}


- move
{
	float factor;
	float speed;
	NXRect	new, tmpRect, myRect = {0,0,0,0};
	
	new.origin.x = [brain getXPos];
	new.origin.y = [brain getYPos];
	new.size.width = WIDTH;
	new.size.height = HEIGHT;
		
	switch(fxType) 
	{
		
		case(0):
			[fish composite:NX_SOVER toPoint:&new.origin];
			break;
			
		case(1):
			speed = sqrt( pow([brain getXSpeed],2 ) 
			+ pow([brain getYSpeed],2) );
			tmpRect.origin.x = (random() % 5) / speed 
			* (old.origin.x - new.origin.x);
			tmpRect.origin.y = (random() % 5) / speed
			* (old.origin.y - new.origin.y);
			factor =  0.02 * dissolveFactor ;
							
			[fish_buffer getSize:&myRect.size];
			[fish_buffer lockFocus];			
				[fish composite:NX_COPY toPoint:&myRect.origin];			
				[fish dissolve:factor toPoint:&tmpRect.origin];
			[fish_buffer unlockFocus];
			[fish_buffer composite:NX_SOVER toPoint:&new.origin];			
			break;	
			
		case(2):		
			[fish composite:NX_DOUT toPoint:&new.origin];
			break;
	}

	old = new;
	return self;
}

- viewDidResize;
{
	NXRect rect;
	
	[aquarium getFrame:&rect];
	
	sizeOfAquar = rect.size;
	
	[brain viewDidResize:&sizeOfAquar];

	return self;
}
	
@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.